We've just released more improvements to the page builder in an ongoing mission to give our users the fastest and smoothest experience while creating a page. Many users, including ourselves, noticed long pages would become laggy as you scrolled down them in the builder. This affected several aspects, such as dragging handles, duplicating elements, and typing content to name a few.
This performance optimization makes it so no matter how much content you add to your page, your building experience won't be affected. So go out there and create the best and longest page you can build!